Improvement in flaming-machines



2 Sheets-'-She et1. I. F. THOMPSON.

Planing-Machines. N0.154,30l. Patented Aug. 18,1874.

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' WE GRAPHIC CD- PHDYU LlTH.39l4-l PARK FLACE,N.Y.

' I IRA F. THOMPSON, OF

UNITED. S A

WORTHEN, OF SAME PLACE.

BOSTON, MASSACHUSETTS, ASSIGNOR TO HARRY N.

IMPROVEMENT lNgPLAhllNG-MACHINES.

Specification forming part of Letters Patent No. 154,301 dated August 18, 1874; application filed June 26,1874. a

To all whom it may concern:

Be it known that I, IRA F. THoMPsoN, of Boston, in the county of Suffolk and State of Massachusetts, have invented an Improve commodate itself to the varying inequalities in the surface of the material being operated on. This unyielding hold or resistance to the upward action of the knives upon the material prevents absolutely the lifting of a knot or shake or sliver in the material by the knives of the rotary cutter, and otherwise secures a perfect planing of the surface of the board.

Under this invention'the object above stated is secured by the combination within the planing-machine of a fixed and unyielding bar and a bed, which is located below the said rigid bar, to support the material as it passes under the said bar and the rotary cutter, and in such locationis arranged and adapted to yieldto accommodate itself to the varying inequalities in the surface of the material being operated In the accompanying plates of drawings, Figure 1, Plate 1, is a plan view. Fig. 2, Plate 2, is a longitudinal section in plane of line a; m,- Fig. 3, a transverse vertical section in plane of line 3 y, Fig. 2, Plate 2. Fig. 4, Plate 1, is a. modification, hereinafter described.

In the drawings, A represents the ordinary rotary cutter of a wood-planin g machine,which cutter is supported in a frame-work or driven by parts, as ordinarily in such machines, and therefore needs no particular illustration or description herein, as, it forms no part of the present invention; B, thebed or platenof the machine, and O the rigid bar for resisting and holding the wood againstgthe upward action of the knives of theliiotary cutter thereon.

The bed B is composed of a frame, D, provided with transverse rollers E at various points of its length, as shown in the drawings, and as a whole it is located within and along the side frame F of the machine, extending under the rotary cutter A. In this location of the bed B the bed is supported at each end upon rubber cushions or springs a a, so that it can yield in a downward direction. The rigid and resistingbar O is located above the bed B, and it is secured at each end, by setscrews b, to the side frame F of the machine, extending across from one side to the other of the bed B. The location of the bar 0 is as near as possible to the path of the knives of the rotary cutter, and otherwise the bar is located to be rigid, fixed, and unyielding in an upward or any other direction during the op I eration of the machine. The bar 0 is made with slots 0 for convenience of adjusting it in position with reference to the path of the knives of the rotary cutter, and it is provided with a hood, G, which partially surrounds the cutterhead;

In the operation of the machine the material to be planed passes along the bed B under the bar 0 to the rotary cutter, and thence out of the machine, and while the bed yields to the material, accommodating itself to the varying inequalities in the surface being 0perated on, the bar, as it is rigid and unyielding, firmly and rigidly confines the material to the knives of the rotary cutter, and, holding it against the upward action of the knives as they pass upwardly from the material, prevents absolutely the lifting of a knot or shake or sliver in the material thereon.

Under an arrangement of a yielding bed, B, and rigid resisting bar 0, such as above described, the rollers H I, for feeding the material to the rotary cutter, are driven as ordinarily, and the two rollers are secured to the yielding bed. The rollers K L, between which the material passes from the cutter-head, are both upon the yielding bed, and the upper one, K, is adapted, as shown at d, Fig. 2, to rise and lower, springs e confining 1t to the planed surface of the material.

The resisting bar 0 may be made of various shapes and forms other than that shown-as,

for instance, it may be round; but it is preferable that it should have an extended bearing upon the material being planed, and, in lieu of only one sucheba r, two or more may be used.

In lieu of arranging thebed'upon springsat both ends, it may be hung on pivots f at one end and supported on springsat the other; and, in lieu of springs, a weighted lever 0r1evers, M, as shown in Fig. 4, Plate 1 of the drawings, may be substituted. Having now described my invention, what I claim, and desire to secure by'Letters Patent, is

1. The combination, with a rigid or unyielding fixed resisting bar, 0, of a yielding bed or platen, B, supporting a rotary cutter, A, substantially as and for the purpose described.

2 The bed or platen B, arranged and supportedrwithin the frame-work of the planingmachine upon springs or cushions a, con- 

